Block: collapse [ \t]*\n[ \t]* to \n inside paragraphs

Strip [ \t]+ on either side of the soft-break joiner emitted for a
single eol, and ltrim the first cdata of each paragraph. Without this,
DokuW

Block: collapse [ \t]*\n[ \t]* to \n inside paragraphs

Strip [ \t]+ on either side of the soft-break joiner emitted for a
single eol, and ltrim the first cdata of each paragraph. Without this,
DokuWiki preserved leading/trailing whitespace on continuation lines
verbatim, which is invisible in HTML but may visible in plain-text
and other renderers. It is also a requirement in the Markdown spec.

Re-baseline the parser-mode tests that pinned the old preserve
behavior (cdata adjacent to <code>/<file>/<rss>/header/footnote).

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replace DW Hr with unified GfmHr

Single mode covers both DokuWiki (4+ dashes) and GFM (3+ of -/*/_)
horizontal rules; pattern self-narrows on $conf['syntax']. Always
loaded across all four syntax se

replace DW Hr with unified GfmHr

Single mode covers both DokuWiki (4+ dashes) and GFM (3+ of -/*/_)
horizontal rules; pattern self-narrows on $conf['syntax']. Always
loaded across all four syntax settings, mirroring the GfmQuote
replacement pattern. Same `hr` handler call so renderers and the
call API are unchanged.

Drops DW's old [ \t]* leading-whitespace tolerance — inert in
practice past 0-1 spaces (Preformatted at sort 20 intercepts
everything ≥ 2 spaces or any tab).

Spec examples 13, 20, 26-28, 224 turn green; 17, 21-24, 29, 30, 31
go to skip.php as deliberate non-implementations (whitespace
tolerance and list-precedence cases).

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replace DW Quote with unified GfmQuote

GfmQuote covers blockquote parsing for both DokuWiki and GFM dialects
in a single mode. Same quote_open/quote_close handler instructions; a
DW-preferred post-p

replace DW Quote with unified GfmQuote

GfmQuote covers blockquote parsing for both DokuWiki and GFM dialects
in a single mode. Same quote_open/quote_close handler instructions; a
DW-preferred post-pass flattens sub-parsed paragraph wrapping into
linebreak calls so existing pages keep their <br/>-between-lines
rendering. MD-preferred keeps the <p>-wrapped spec shape.

Block content (lists, fenced code, tables) inside `>` quotes now
renders, since the body is sub-parsed. Headers stay excluded
(BASEONLY) — TOC and section-edit anchors don't compose with
<blockquote>, same rationale as GfmListblock.

Convert ModeRegistry's sub-parser cache into an acquire/release pool
to support same-key re-entrancy: a list inside a quote re-enters
gfm_quote during the list-item sub-parse, and the inner call needs
its own parser instance even though the exclusion key matches.
GfmListblock is updated to use the new acquire/release primitives.

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require non-whitespace adjacency for inline formatting delimiters

An opening delimiter must now be followed by a non-whitespace character,
and a closing delimiter must be preceded by one. Empty deli

require non-whitespace adjacency for inline formatting delimiters

An opening delimiter must now be followed by a non-whitespace character,
and a closing delimiter must be preceded by one. Empty delimiter pairs
(****, ____, '''', , , <del></del>) no longer
match and stay literal.

Rationale: this matches Markdown's flanking-delimiter
rules and eliminates accidental bolding of sequences like `** note**`
at the start of a sentence. Well-formed uses (**bold**, //italic//,
__underline__) are unchanged.

Affected modes: Strong, Emphasis, Underline, Monospace, Subscript,
Superscript, Deleted.

BREAKING: content that was already malformed but
previously rendered as formatted (e.g. `**foo bar **`) now stays
literal.

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prevent inline formatting from matching across paragraph boundaries

The Lexer compiles all patterns with the `s` (DOTALL) flag via
ParallelRegex::getPerlMatchingFlags(), which makes `.` match newlin

prevent inline formatting from matching across paragraph boundaries

The Lexer compiles all patterns with the `s` (DOTALL) flag via
ParallelRegex::getPerlMatchingFlags(), which makes `.` match newlines.
Inline formatting modes use lookaheads like `\*\*(?=.*\*\*)` to verify
a closing delimiter exists, so with DOTALL a lone `**` happily matched
its "closer" many paragraphs later, swallowing blank lines into a
single <strong> run.

Add CONTENT_UNTIL_PARA on AbstractMode — a regex snippet matching any
character unless it would start a paragraph break (blank line, possibly
with horizontal whitespace). Update all inline formatting entry patterns
(Strong, Emphasis, Underline, Monospace, Subscript, Superscript,
Deleted) to use it in their closing-delimiter lookaheads.

Emphasis also gets a real closing-`//` check; its previous lookahead
just verified "content exists with a non-colon char" without requiring
the closing delimiter at all.

Single newlines inside a delimiter pair still match (multi-line
formatting); only blank lines end it.

BREAKING: This means you no longer can mark multiple paragraphs as bold
or strike them out. On the other hand it prevents accidentally breaking
the page layout by missing a closing delimiter (as reported many many
times over the years) eg. #1025 #3588 #1056

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migrate parser tests to modern namespaced classes

Move old-style parser tests from _test/tests/inc/parser/ to namespaced
test classes under _test/tests/Parsing/ParserMode/ and
_test/tests/Parsing/Le

migrate parser tests to modern namespaced classes

Move old-style parser tests from _test/tests/inc/parser/ to namespaced
test classes under _test/tests/Parsing/ParserMode/ and
_test/tests/Parsing/Lexer/.

- Add ParserTestBase with assertCalls() helper for comparing handler
call sequences with byte index stripping
- Split lexer.test.php into ParallelRegexTest, StateStackTest, and
LexerTest with a RecordingHandler that extends Handler
- Merge handler_parse_highlight_options tests into CodeTest
- Add new tests for previously untested modes: Nocache, Notoc, Rss,
and all individual formatting modes (Strong, Emphasis, etc.)
- Modernize test code: [] syntax, lowercase null, correct assertEquals
argument order, replace deprecated withConsecutive and string callables
- Renderer tests remain in old location (renderers not yet migrated)

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